CN108598714A - A kind of electromagnetic induced transparency metamaterial structure that polarization is unrelated - Google Patents
A kind of electromagnetic induced transparency metamaterial structure that polarization is unrelated Download PDFInfo
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- CN108598714A CN108598714A CN201810389169.9A CN201810389169A CN108598714A CN 108598714 A CN108598714 A CN 108598714A CN 201810389169 A CN201810389169 A CN 201810389169A CN 108598714 A CN108598714 A CN 108598714A
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- metal wire
- induced transparency
- electromagnetic induced
- medium substrate
- metamaterial structure
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
- H01Q15/0006—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices
- H01Q15/0086—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices said selective devices having materials with a synthesized negative refractive index, e.g. metamaterials or left-handed materials
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Abstract
A kind of electromagnetic induced transparency metamaterial structure that polarization is unrelated, belongs to Meta Materials technical field, solves the problems, such as that the electromagnetic induced transparency characteristic of the electromagnetic induced transparency Meta Materials of existing unsymmetric structure is limited to incidence wave polarization direction stability.Electromagnetic induced transparency metamaterial structure of the present invention includes medium substrate and windmill-shape metal unit, and medium substrate is square, and windmill-shape metal unit includes the metal wire of the first metal wire~the 4th, four shape and size all same.First metal wire is the right-angle Z-shaped structure being made of long line and two short-terms, and the first metal wire~the 4th metal wire is coplanar and the conformal heart etching of long side is on medium substrate.For the metal wire of the first metal wire on medium substrate~the 4th, the former overlaps after rotating 45 ° counterclockwise with the latter.Destructive coupling of the electromagnetic induced transparency metamaterial structure of the present invention based on scattering field between metal wire is come simulated implementation electromagnetic induced transparency effect.
Description
Technical field
The present invention relates to a kind of electromagnetic induced transparency metamaterial structures, belong to Meta Materials technical field.
Background technology
Electromagnetic induced transparency effect is a kind of quantum coherence effect in atomic system, opaque medium can be caused one
It is presented as transparent state in a very narrow spectral regions, and makes incidence wave that strong effect of dispersion occur.Therefore, electromagnetic induction is saturating
Obvious results should have extremely important application in the research fields such as slowing light velocity and raising sensor sensitivity.
In recent years, also of increased attention for simulating the Meta Materials of electromagnetic induced transparency effect.Currently, grinding
Study carefully personnel and successfully simulates electromagnetic induced transparency effect in the Meta Materials of microwave, THz wave and optical band.These sides
Meta Materials in case are typically based on the particular resonator structure of bright, dark mould resonance or Defect Modes resonance, and this kind of Meta Materials are because of profit
Electromagnetic induced transparency effect is induced with the destruction interference between resonant mode and leads to the asymmetry of self structure.However,
The electromagnetic induced transparency characteristic of this kind of unsymmetric structure Meta Materials is highly dependent on the stabilization of incidence wave polarization direction, works as incidence wave
Polarization direction when changing, the electromagnetic induced transparency characteristic of this kind of Meta Materials, which can weaken, even to disappear, this is serious to limit
The applications of this kind of Meta Materials.
Invention content
The present invention is that the electromagnetic induced transparency characteristic for the electromagnetic induced transparency Meta Materials for solving existing unsymmetric structure is limited
In the incidence wave polarization direction stability the problem of, it is proposed that a kind of electromagnetic induced transparency metamaterial structure that polarization is unrelated.
The unrelated electromagnetic induced transparency metamaterial structure of polarization of the present invention includes medium substrate and windmill-shape metal
Unit；
Medium substrate is square；
Windmill-shape metal unit includes the metal wire of the first metal wire~the 4th, four shape and size all same；
First metal wire is the right-angle Z-shaped structure being made of long line and two short-terms；
First metal wire~the 4th metal wire is coplanar and the conformal heart etching of long side is on medium substrate；
For the metal wire of the first metal wire on medium substrate~the 4th, the former overlaps after rotating 45 ° counterclockwise with the latter.
As preferably, the length of side of medium substrate is 19mm, thickness 1mm, relative dielectric constant 4.3, loss angle
Just it is cut to 0.01.
As preferably, the both ends of the long line of the first metal wire are overlapped with the external connection end of two short-terms respectively；
The line width of first metal wire is 1mm, and long line length is 16.5mm, and short-term length is 3mm.
As preferably, medium substrate and the conformal heart of windmill-shape metal unit.
The unrelated electromagnetic induced transparency metamaterial structure of the present invention that polarizes, windmill-shape is etched on medium substrate
Metal unit.Windmill-shape metal unit includes the first metal wire~the 4th metal wire of right-angle Z-shaped, the gold medal of the first metal wire~the 4th
The rotation angle for belonging to line is different, and the angle between two adjacent metal lines is 45 °.The electromagnetic induced transparency Meta Materials knot
Structure simulates electromagnetic induced transparency effect based on the destructive coupling of scattering field between metal wire.
Compared with the electromagnetic induced transparency Meta Materials of existing unsymmetric structure, the super material of electromagnetic induced transparency of the present invention
Expect that structure has the symmetry of height.Therefore, the electromagnetic induced transparency of electromagnetic induced transparency metamaterial structure of the present invention
Characteristic is unrelated with the polarization direction of incidence wave.
Description of the drawings
The electromagnetic induced transparency unrelated to polarization of the present invention will hereinafter be carried out based on the embodiments and with reference to the accompanying drawings
Metamaterial structure is described in more detail, wherein：
Fig. 1 is the structural schematic diagram of the unrelated electromagnetic induced transparency metamaterial structure of polarization described in embodiment；
Fig. 2 is the pictorial diagram for the electromagnetic induced transparency Meta Materials that embodiment refers to；
First metal wire 2, the second metal wire 3 and the 4th metal wire when the y polarized electromagnetic wave incidences that Fig. 3 refers to for embodiment
5 and the 2~the 4th metal wire 5 of the first metal wire artificial transmission spectrum；
Electromagnetic induced transparency Meta Materials knot when Fig. 4 is the linear polarised electromagnetic wave incidence for the different polarization directions that embodiment refers to
The artificial transmission spectrum of structure；
Electromagnetic induced transparency Meta Materials knot when Fig. 5 is the linear polarised electromagnetic wave incidence for the different polarization directions that embodiment refers to
Spectrum is transmitted in the test of structure；
Electromagnetic induced transparency when Fig. 6 is the left-hand circular polarization electromagnetic wave that embodiment refers to and right-handed circular polarization electromagnetic wave incident
The artificial transmission spectrum of metamaterial structure；
Fig. 7 is effective group index of the unrelated electromagnetic induced transparency metamaterial structure of polarization described in embodiment and effectively rolls over
Penetrate the analogous diagram of rate imaginary part；
Fig. 8 is that the unrelated electromagnetic induced transparency metamaterial structure of the polarization described in embodiment is normal with respect to dielectric in three kinds of differences
Artificial transmission spectrum in several media.
Specific implementation mode
Furtherly below in conjunction with the attached drawing electromagnetic induced transparency metamaterial structure unrelated to polarization of the present invention
It is bright.
Embodiment：The present embodiment is explained in detail with reference to Fig. 1~Fig. 8.
The unrelated electromagnetic induced transparency metamaterial structure that polarizes described in the present embodiment includes medium substrate 1 and windmill-shape gold
Belong to unit；
Medium substrate 1 is square；
Windmill-shape metal unit includes the first metal wire 2, the second metal wire 3, third metal of shape and size all same
Line 4 and the 4th metal wire 5；
First metal wire 2 is the right-angle Z-shaped structure being made of long line and two short-terms；
First metal wire 2, the 5 coplanar and conformal heart of long side of the second metal wire 3, third metal wire 4 and the 4th metal wire
Etching is on medium substrate 1；
It is preceding for the first metal wire 2, the second metal wire 3, third metal wire 4 and the 4th metal wire 5 on medium substrate 1
Person overlaps after rotating 45 ° counterclockwise with the latter.
The length of side a of the medium substrate 1 of the present embodiment is 19mm, and thickness 1mm, relative dielectric constant 4.3, loss angle is just
It is cut to 0.01.
The medium substrate 1 of the present embodiment uses FR4 plates.
The both ends of the long line of first metal wire of the present embodiment are overlapped with the external connection end of two short-terms respectively, line width w=
1mm, long line length h=16.5mm, short-term length l=3mm.
The medium substrate 1 of the present embodiment and the conformal heart of windmill-shape metal unit.
First metal wire 2, the second metal wire 3, third metal wire 4 and the 4th metal wire 5 of the present embodiment are copper wire.
Illustrate the electromagnetic induced transparency Meta Materials knot described in the present embodiment with reference to simulation result and actual test result
The electromagnetic induced transparency characteristic of structure is unrelated with the polarization direction of incidence wave：
First metal wire 2, the second metal wire 3 and the 4th metal wire 5 and the first gold medal when Fig. 3 is y polarized electromagnetic wave incidences
Belong to the artificial transmission spectrum of the metal wire 5 of line 2~the 4th.As shown in figure 3, the first metal wire 2 generates a biography at 5.1GHz
Defeated resonance, quality factor are about 2.0 (quality factor=resonant frequency/half-wave bandwidth).Second metal wire 3 and the 4th metal wire 5
A transmission resonance is generated at 5.9GHz, quality factor are about 2.2.Therefore, it regard the first metal wire 2 as illuminated state resonator,
It regard the second metal wire 3 and the 4th metal wire 5 as quasi- dark-state resonator, and utilizes the near-field coupling between metal wire so that one
A centre frequency is that the transparency window of 6.1GHz appears in transmission spectrum, i.e. solid line in figure.
The artificial transmission spectrum of electromagnetic induced transparency metamaterial structure when Fig. 4 is different polarization direction linear polarised electromagnetic wave incidences
Line chart, the test transmission spectral line of electromagnetic induced transparency metamaterial structure when Fig. 5 is different polarization direction linear polarised electromagnetic wave incidences
Figure.According to Fig. 4 and Fig. 5：For the linear polarization incident electromagnetic wave of different polarization directions, the resonant frequency and resonance of transparency window
Peak value all keeps stable, and test result is coincide preferably with simulation result.Therefore, the electromagnetic induced transparency described in the present embodiment
The electromagnetic induced transparency characteristic of metamaterial structure is unrelated with the polarization direction of incidence wave.
Electromagnetic induced transparency metamaterial structure when Fig. 6 is left-hand circular polarization electromagnetic wave and right-handed circular polarization electromagnetic wave incident
Artificial transmission spectrum.As shown in fig. 6, the emulation of electromagnetic induced transparency metamaterial structure passes when left-hand circular polarization electromagnetic wave incident
Defeated spectral line is overlapped with the artificial transmission spectral line of electromagnetic induced transparency metamaterial structure when right-handed circular polarization electromagnetic wave incident, no matter right
In left-hand circular polarization electromagnetic wave or right-handed circular polarization electromagnetic wave, same transparency window still appears in transmission spectrum.Therefore, originally
Electromagnetic induced transparency metamaterial structure described in embodiment all opens up linear polarization incident electromagnetic wave and circular polarisation incident electromagnetic wave
Reveal the unrelated electromagnetic induced transparency characteristic that polarizes.
The unrelated electromagnetic induced transparency metamaterial structure that polarizes described in the present embodiment can also be applied to low-loss slow
Optical transport.Fig. 7 is effective group index of the unrelated electromagnetic induced transparency metamaterial structure of polarization described in embodiment and effectively rolls over
Penetrate the analogous diagram of rate imaginary part.As shown in fig. 7, in transparency window, effective group index is about 125, and effective refractive index imaginary part is very small,
This means that the velocity of wave of incident electromagnetic wave can not only be reduced to original velocity of wave by the electromagnetic induced transparency metamaterial structure
1/125, additionally it is possible to realize low-loss transmission.
The unrelated electromagnetic induced transparency metamaterial structure that polarizes described in the present embodiment also acts as the biography based on refractive index
Sensor.For the sensing capabilities of evaluation sensor, the electromagnetic induced transparency metamaterial structure is introduced into three kinds of different Jie
In matter, artificial transmission spectrum is as shown in Figure 8.As can be seen from FIG. 8：(the namely refractive index when the relative dielectric constant difference of medium
When different), transparency window has occurred apparent resonance shift, factor of merit (factor of merit=susceptibility/half-wave bandwidth, susceptibility=
Resonance wavelength shift amount/refractive index variable quantity) it is about 8.73, sensing capabilities are better than asymmetric openings ring structure.Therefore, this reality
It applies the electromagnetic induced transparency metamaterial structure described in example and can also be applied to environment, chemical sensitisation field.
By carrying out whole in proportion contract to the unrelated electromagnetic induced transparency metamaterial structure of the polarization described in the present embodiment
It is small, it can make the electromagnetic induced transparency metamaterial structure that electromagnetic induced transparency effect occur under the incidence wave of its all band.
Although describing the present invention herein with reference to specific embodiment, it should be understood that, these realities
It is the example of principles and applications to apply example only.It should therefore be understood that can be permitted exemplary embodiment
More modifications, and can be designed that other arrangements, spirit without departing from the present invention as defined in the appended claims and
Range.It should be understood that can be by combining different appurtenances different from mode described in original claim
It is required that and feature described herein.It will also be appreciated that the feature in conjunction with described in separate embodiments can be used at it
In his embodiment.
Claims (4)
1. a kind of electromagnetic induced transparency metamaterial structure that polarization is unrelated, which is characterized in that the electromagnetic induced transparency Meta Materials
Structure includes medium substrate and windmill-shape metal unit；
Medium substrate is square；
Windmill-shape metal unit includes the metal wire of the first metal wire~the 4th, four shape and size all same；
First metal wire is the right-angle Z-shaped structure being made of long line and two short-terms；
First metal wire~the 4th metal wire is coplanar and the conformal heart etching of long side is on medium substrate；
For the metal wire of the first metal wire on medium substrate~the 4th, the former overlaps after rotating 45 ° counterclockwise with the latter.
2. the electromagnetic induced transparency metamaterial structure for polarizing as described in claim 1 unrelated, which is characterized in that medium substrate
The length of side is 19mm, thickness 1mm, relative dielectric constant 4.3, loss angle tangent 0.01.
3. the electromagnetic induced transparency metamaterial structure for polarizing as claimed in claim 2 unrelated, which is characterized in that the first metal wire
The both ends of long line overlapped respectively with the external connection end of two short-terms；
The line width of first metal wire is 1mm, and long line length is 16.5mm, and short-term length is 3mm.
4. the electromagnetic induced transparency metamaterial structure for polarizing as claimed in claim 3 unrelated, which is characterized in that medium substrate with
The conformal heart of windmill-shape metal unit.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110808474A (en) * | 2019-11-11 | 2020-02-18 | 上海理工大学 | Metamaterial capable of realizing polarization-independent electromagnetic induction-like transparent effect |
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Application publication date: 20180928 |